Tektronix 1720 Series
Vectorscopes Complete Specifications

Signal Input (Video and External Reference)
Return Loss	>40 dB, 50 kHz to 6 MHz, power on or off
Maximum Input	±5 V DC + peak AC
Loop-through Isolation	>70 dB at F_SC
Channel Isolation	>70 dB at F_SC
Impedance	>15 kΩ
Chrominance Bandwidth
Upper	3 dB point, F_SC +500 kHz, ±100 kHz
Lower	3 dB point, F_SC -500 kHz, ±100 kHz
Vector Phase Accuracy	Within 1.25°
Vector Gain Accuracy	Within 2.5%, typical
Quadrature Phasing	Within 0.5°, typical
Subcarrier Regenerator
Pull-in Range	F_SC ±50 Hz
Pull-in Time	Within 1 second
Phase Shift with Subcarrier Frequency	2° ±50Hz
Phase Shift with Burst Amplitude Change	<2° with ±6 dB change from nominal
Phase Shift with Input Channel Change	<0.5°
Phase Control Range	360° continuous rotation
Burst Jitter	<0.5°
Display Differential Phase and Gain	±1° and ±1%
Center Dot Clamp Stability	<0.4 mm spot movement
Synchronization
Internal	Composite video with sync ±6 dB of nominal
External Reference	Composite video or CW subcarrier
XY Mode
Input	Differential, DC coupled
Input Amplitude	2 to 9 V p-p, adjustable full scale deflection 0 dBm for 600W system, factory set to 0 dBm
Maximum Input	±15 V peak signal + DC
Frequency Response	DC to 500 kHz (Dc to 100 kHz high-gain mode)
X and Y Phase Match	Less than a trace with separation at 20 kHz
SCH Mode (1720 SCH and 1721 SCH Only)
Accuracy	Absolute: ±5° phase at 25°C Relative: ±2°
Acquisition Time	Less than 1 second